If you do add a system property I think it would be better to allow overriding the client interceptors via system property. So to disable:

-Dorg.jboss.ejb.client.interceptors

or to override:

-Dorg.jboss.ejb.client.interceptors=com.MyInterceptor1,com.myInterceptor2

But only if you think it is actually worth adding the system property in the first place.